Boring jig for doors



June 1, 1954 E. SCHLAGE BORING JIG FOR DOORS 2 Sheets-Sheet 1 Filed Jan. 2, 1952 JNVEN TOR. EPA/557' L. 56/71/76! W Arroewsy June 1, 1954 E. SCHLAGE 2,679,771

BORING JIG FOR DOORS Filed Jan. 2, 1952 2 Sheets-Sheet 2 INVENTOR. [FA [571, 56/7246! BYMV Patented June 1, 1954 BORING JIG FOR DOORS Ernest L. Schlage, Burlingame, Calif., assignor to Schlage Lock Company, a corporation Application January 2, 1952, Serial No. 264,623

6 Claims. 1

My invention relates to means for use primarily in installing locks in door panels and is particularly concerned with a structure for use by a carpenter in boring a pair of intersecting holes into and through the door panel for the reception of a cylindrical or tubular lock. The invention is particularly concerned with a mechanism effective to provide a substantially standard and proper location and spacing of the two holes.

In mounting locks in door panels, it is often difiicult for the workman, usually a carpenter, to locate the hole which necessarily extends transversely through the door panel with respect to the other hole which extends inwardly from the edge of the door panel and intersects the first hole. It is not especially difiicult to space the holes properly from the floor or from the top of the door, although that becomes a chore in the event a number of similar installations have to be made, but it is dificult to start a boring tool into the edge of a door, particularly if the door is beveled, and to maintain the appropriate direction and location of the bore into the door panel without serious run out, especially if the door panel is quite thin. It is likewise difiicult to provide a transverse hole with its axis substantially intersecting the axis of the edge hole and at the selected or desired distance from the door edge.

It is therefore an object of my invention to provide a boring jig readily usable by a workman in any one of a number of ,difierent installations to assist him in locating the proper positions for the two necessary holes and to assist him in boring those holes.

Another object of the invention is to provide a boring jig which can readily be utilized with doors of various thicknesses and will nevertheless appropriately locate the holes.

Another object of the invention is to provide a boring jig readily disposed at any selected height on the door.

A still further object of the invention is to provide a boring jig readily usable with a door panel having an edge bevel.

An additional object of the invention is to provide a boring jig in which the transverse hole extending through the door panel can readily be located at any one of a number of selected distances from the door edge.

A still further object of the invention is to provide a boring jig which is readily usable by a workman without necessitating much variation in the normal technique of door lock mounting.

A still further object of the invention is in general to improve boring jigs.

Other objects, together with the foregoing, are attained in the embodiments of the invention described in the accompanying description and illustrated in the accompanying drawings in which Figure 1 is a front elevation of a boring jig for a door constructed in accordance with my invention and shown in mounted position on a typical door, portions of the figure being broken away or omitted to reduce its size.

Figure 2 is a side elevation of the structure shown in Figure 1 with similar broken away portions and with a boring bit illustrated partially in position.

Figure 3 is a cross section, the plane of which is indicated by the line 3-3 of Figure 2.

Figure 4 is a cross section, the plane of which is indicated by the line 4-4 of Figure 2.

Figure 5 is a cross section, the plane of which is indicated by the line 5-5 of Figure 4.

Figure 6 is a rear elevation of the structure shown in Figure 1, certain portions being broken away and some parts being illustrated in slightly different position.

Figure 7 is a cross section to an enlarged scale of the marking structure, the plane of section being indicated by the line l---'! of Figure 2 Figure 8 is a side elevation of the marking structure to the same scale as the showing in Figure '7.

Figure 9 is a cross section similar to Figure 7 but showing a variant form of marking device.

Figure 10 is a view similar to Figure 8 but showing a still further modified form of marking device.

Figure 11 is a bottom view of the structure shown in Figure 10.

Figure 12 is a cross section showing the structure of Figure 10.

Figure 13 is a top viewof the structure shown in Figure 10.

Figure 14 is a cross section, partly in elevation showing a modified form of external guide, portions being broken away to show the interior construction.

The boring jig of my invention is intended primarily for use on a door panel 6 having a vertical edge face i which terminates at a top edge 8. The panel has a pair of parallel side faces, 9 and II. The edge face 1 often is at right angles exactly to the side faces but usually is inclined in either direction thereto to provide a bevel I3, especially as shown in Figure 3. It is desired to provide in the door panel a transversely bored hole [4 and an intersecting edge hole l6 arranged with the axis ll of the hole 16 perpendicular to the axis l8 of the hole [4. The thickness of the door panel varies in individual instances even though the nominal dimension thereof may be established, and, also, the nominal thickness varies over a wide range.

As also shown in my copending application entitled Boring Jig, Serial No. 185,018, filed September 15, 1950, I preferably provide a structure for automatically locating the axis [1 midway between the planes of the side panels of the door of any thickness. That is accomplished by a structure also having the effect of a clamp. An upper clamping member 2| is formed of material in substantially a U shape to embrace the sides of the thickest door to be bored and has in addition to its side portions 22 and 23 an edge portion 24. An edge link 26 in the form of a generally planar reinforced member is joined to the clamping member 2! by a pivot pin 21. Somewhat similarly, there is provided a lower clamping member 28 also formed of bent material having an edge plate 29 and having a side member 30. A pivot pin 3| connects the member 28 and the edge link 26. The clamping member 28 is also provided with a substantially planar upstanding extension 32 underlying the side member 23. An adjusting or clamping screw 33 is. engaged in a threaded boss 34 in the member 23 and is provided with a non-circular hand wheel 36 so that the screw 33 can be rotated. The screw is also provided with a somewhat loosely constructed journal engagement 3'! with the upstanding member 32. The effect of this arrangement is that when the hand wheel 36 is tightened after the clamping structure has been placed to embrace the edge of a door, the side member 30 with the extension 32 and the side portion 22 are moved to approach each other and. frictionally to grip the sides of the door.

It is also important that the boring jig be disposed in close abutment with the edge face I of the door whether that face is beveled or is straight. In order to avoid any possible cocking or displacement of the boring jig due to the variant inclination of the door edge, I arrange that the pivot pins 21 and 3| have enlarged and extended ends 4| projecting inwardly beyond the general plane of any of the parts of the edge portion 24, of the lower clamping member 28 and of the intermediate edge link 26. Thus the projecting pivot pins 4| themselves come into point contact with the edge face I of the door. Preferably such contacts are on the median vertical line of the door edge, but because of the different inclinations of the link 26 with door panels of different thicknesses, those contacts are not made precisely on the median line except with one door thickness. However, the locations of the extended pivot pins are sufficiently close to a median position under any circumstances to locate the boring jig with accuracy well within the working tolerance. The contact with the door edge being solely at two points, any inclination or bevel of the door does not cock or throw the boring jig oif from its proper position. Consequently, when the jig is urged to contact the door edge while it is clamped to the door panel by the use of the hand wheel 36, it is always accurately located.

In single installations it is fairly simple to measure the height of the lock installation either from the floor or from the top edge 8 of the door,.

but where a number of installations are to be made at about the same time and at the same elevation, I provide (especially as shown in Figures 1 and 2) the side portion 22 with a pair of apertures 42 and 43 piercing the reinforcing ribs therein. These are for the reception of removable fastenings 44 effective to hold a detachable slotted gauge bar 46 in position. This device is usually mounted to extend vertically upward from the upper clamping member 2|. At its upper end the gauge bar is provided with an inturned hook 41 adapted to abut the top edge 8 or" the door panel. This effectively positions the axis ll of the boring jig at a selected height from the top edge of the door. By inversion the bar 46 can be installed in a position extending downwardly. In that instance, the end 48 of the hook can be placed in abutment with the fioor and a selected measurement from the floor utilized for setting the height of the boring jig.

To assist in guiding a boring bit 5! into the edge of the door the link 26 is provided with a fixed and perpendicularly projecting circular cylindrical guide 52. The internal diameter of the guide is sufficient to accommodate and properly locate a bit of the largest size to be employed. In use, the bit is inserted into the tubular guide 52 and is rotated and advanced in the usual fashion to bore a hole. Under some circumstances a bit of the maximum size is too large. There is provided a mechanism for appropriately locating and supporting a bit of smaller diameter. A separate sleeve 53 having a marginal flange 54 is telescoped into the external guide 52 from the inside of the link 26. The flange 54 is thin enough to lie between the link 25 and the edge plate 29 of the lower clamping member 28.

The contour of the upper edge 55 of the lower clamp member is such that the flange 54 clears it in an axial direction only when the boring jig is expanded to accommodate a door of maximum thickness, especially as shown in Figure 6, Under those circumstances, the removable sleeve 53 can be inserted and withdrawn easily. After the sleeve has been positioned with the flange 54 in close abutment with the link 26, the hand wheel 36 is revolved to reduce the space between the sides of the boring jig to accommodate doors of usual thickness. The upper edge 56 then travels laterally over the flange 54 into a position as shown in Figure 1 and prevents axial dislodgment of the interior sleeve 53. Once positioned, the inner sleeve cannot fall out accidentally. The interior diameter of the sleeve 53 accommodates a smaller bit for boring a smaller hole.

The mechanism for boring a hole I8 is therefore effective to locate the hole substantially centrally between the side planes of the door with its axis l1 parallel to the planes of the sides of the door and in a generally horizontal direction. Even though only a thin wall remains between the bore and the sides of the door, that wall is uniformly thick and the bore does not run out toward the side of the door panel.

The boring or cutting (as it is sometimes accomplished with an annular saw) of the hole l4 either precedes the making of the bore I6 or follows it, depending on various other factors. In either case, the axis 18 must be appropriately located with respect to the axis It not only at right angles thereto but also in the same horizontal plane therewith at a selected distance from the door edge.

I consequently strike up from the extension 32 a pair of outstanding ears BI and 62 themselves pierced in a vertical direction to accommodate an elongated pivot pin 63, as shown in Figure 4. Also embracing the pivot pin 63 are the arms 64 and 6B of the forked end of a scale 61. Since the axis of the pivot pin 63 is substantially vertical or at right angles to the axes I? and I8, the general longitudinal direction of the scale 61 is parallel to the plane containing the axes. Furthermore, the upper edge 68 of the scale is disposed in the plane of the two axes I! and [8.

In order that the scale can be swung into close abutment with the side face of the door panel and can also be swung away from that face for convenience in use, yet will not be accidentally dislodged when once positioned, I provide that the lower ear E52 be depressed to form a groove 69 therein. In one rotated position of the scale 61 a correspondingly depressed rib H on the arm 66 can interengage with the groove. Some movement along the axis of the elongated pivot pin 83 is possible. A coil spring 12 abutting the upper ear 6| also abuts the arm 65 so that the rib II tends to nest with the groove 69 to inhibit rotation of the scale. When the scale is manually rotated, the rib II rides out of the groove 69 slightly compressing the spring '12, but when the scale is in position substantially abutting the side face of the door, the spring '12 tends to hold the parts so disposed.

The scale is useful in providing different locations horizontally for the axis IS with respect to the edge of the door panel. Along the scale and merging with its upper edge is a series of notches I6, 71, and I8. The series can continue indefinitely, each notch being disposed at a selected distance from the door edge. Each notch is also accompanied by a dimensional indicium 19 marked on the face of the scale to indicate the nominal distance from the door edge.

A scriber, a pencil, .or a similar tool can mark the center or axis location for the bore I4 on the door panel. The scribe or pencil lead is positioned in the corresponding notch '18, TI or 78 and the mark is made. The scale is then swung out of the way and a hole of the appropriate diameter is bored utilizing the mark as the hole center. Preferably a separate tool is dispensed with. Mounted on the scale El is a slide BI comprising a sheet 82 having an aperture 83 therein through which the indicia I9 are visible, the sheet being curved around the lower edge of the scale 67 to form a sliding bearing thereon. The sheet 82 is likewise deformed to provide a boss 84 in which a shaft 85 is journalled for rotation. On the same axis as the journal 85, the shaft is extended to receive a thumb wheel 87 so that upon rotation of the thumb wheel the shaft $6 is similarly rotated. Extending from the shaft 86 but eccentrically disposed with respect thereto is a scribe shank 85 terminating in a sharp point 89. A disc 9| is formed on the scribe shank and is of sumcient extent to overlie the interior of the slide 61 in all rotated positions of the shaft 86. The slide is appropriately guided on the scale for horizontal motion and can readily be moved into any selected position. Movement is precluded, however, when the thumb wheel B'I is turned sufficiently to drive the eccentric scribe shank downwardly into one of the notches I6, 11 or 18. When that occurs, the curved bottom of the sheet is lifted against the scale, and the scribe 88 nests within the notch and is accurately located. It cannot be displaced laterally. The user by pressing inwardly upon the thumb wheel 81, can then force the sharp point 89 into the material of the door, usually wood, and simultaneously mark the door and provide a center depression for starting the boring tool. The scale 61 is swung out of the way and leaves a completely free path for the boring tool. At that time the thumb wheel 81 can likewise be loosened if it is to be moved to a new location. When the thumb wheel is rotated, the eccentric scribe is lifted out of the notch, say 16, and the slide is unclamped so that it can readily be shifted to a new location. The size of the scribe shank is such that when it is located in the notch 16 the point of the scribe is exactly in the plane of the axes I I and l 8.

In a modified form of slide as shown in Figure 9, the thumb wheel IOI is on a spindle I02 having the same axis as the scribe I03, although an intermediate shaft I 04 journalled in the boss I08 of the slide is itself eccentric. Substantially the only difference between the Figure 9 version and the Figure 7 version is that the spindle I02 rises and falls as the wheel IDI rotates. This wheel likewise rises and falls due to the eccentric mounting thereof and it is only necessary to provide a somewhat enlarged aperture in the boss I06 for that purpose. This mechanism is considered some what easier to fabricate.

In the-version shown in Figures 10 to 13, the slide III, although similar to those previously described, is provided with a pair of top tabs H2 and H3 which loosely engage the scale 61 to serve as a guide. Additionally, a scribe H4 projects outwardly from the top. A leaf spring H6 is disposed between the scale and the channel bottom of the slide, and has a wide center disposed in a central opening in the channel bottom to confine the spring lengthwise. The spring urges the slide III downwardly so that a depressed lug H1 in the top of the slide can snap into the notches 16, IT or 18. By lifting up on the slide H I and so compressing the spring Ht, the user can lift the lug II I out of one of the centering or positioning notches. The slide is then readily moved to a new location. When the slide is released, the spring then depresses the lug into the notch and the parts are held in marking location by the action of the spring In some instances, it is desirable to omit an interior flange 54 on the sleeve 53 and to extend the exterior guide 52. This is accomplished as shown in the modification of Figure 14 in which a guide I2I passes through the link 26 and terminates very close to the edge of the door. This prevents large boring chips lodging or jamming between the guide I2I and the door edge. A flanged inner sleeve I22 is disposed within the guide and is held in position by a screw I 26. Alternatively, a leaf spring I2I situated in a longitudinal slot I24 is formed to extend slightly into a hole I23 in the guide I2I. With either form of retainer, the sleeve is held in place firmly, but can readily be removed when a large bit is to be used.

What is claimed is:

1. A boring jig for a door comprising a clamp including members engageable with the opposite sides of said door, a pair of projections on said clamp adapted to abut the edge of said door at points between said sides, a scale on said clamp adapted to overlie one side of said door and spaced a predetermined distance from said projections, there being a notch in said scale for measuring the distance from said projections, a slide movably mounted on said scale, means on said slide engageable in said notch, and

a marker on said slide operable to mark said side of said door.

2. A boring jig for a vertically disposed door comprising a clamp including members engageablewith the opposite sides of said door, a scale, means for mounting said scale on said clamp for relative rotary motion about a vertical axis, and a marker on said scale movable with said scale to mark said side of said door.

3. A boring jig for a door comprising a clamp including a member adapted to lie flat against a side of said door, a scale adapted to overlie said side of said door in a direction perpendicular to the edge of said door, a pivot connection between said scale and said member disposed with the axis of said connection parallel with said edge, and a marker on said scale and engageable with said side of said door.

4. A boring jig for a vertically disposed door comprising a link, means engaging the sides of said door for holding said link in position with respect to the edge of said door, scale means swingably mounted on said engaging means for horizontal movement toward and away from a side of said door, and a marker on said scale means for marking said side of the door at a predetermined location with respect to said link.

5. A boring jig for a door having a pair of opposite faces and a side edge comprising: an elongated link provided with a bit guide centrally of its length and a pair of projections adjacent its opposite ends respectively and adapted to engage said side edge at points between said faces when said link is positioned alongside said side edge, clamping means adapted to engage said opposite faces for so positioning said link, a scale swingably secured to said clamping means at a fixed distance from said projections for movement from a marking position alongside one of said faces to an outer position spaced from said one face whereby a desired distance from said side edge may be marked on said one face when said scale is in said marking position and a bit may be applied to said one face for boring a transverse hole through said door when said scale is swung to said outer position.

6. A boring jig for a door having a pair of opposite faces and a side edge comprising: an elongated link provided with a bit guide centrally of its length and a pair of projections adjacent its opposite ends respectively and adapted to engage said side edge at points between said faces when said link is positioned alongside said side edge, clamping means adapted to engage said opposite faces for so positioning said link, a scale swingably secured to said clamping means at a fixed distance from said projections for movement from a marking position alongside one of said faces to an outer position spaced from said one face whereby a desired distance from said side edge may be marked on said one face when said scale is in said marking position and a bit may be applied to said one face for boring a transverse hole through said door when said scale is swung to said outer position, a slide on said scale movable therealong to different distances from said side edge when said scale is in said marking position, interengaging elements on said scale and said slide for releasably securing the latter to the former, and a pointed marker on said slide for so marking said face with an indentation adapted to receive the point of a boring bit.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 307,848 Drowne et al. Nov. 11, 1884 310,710 Nichols Jan. 13, 1885 

